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79 lines
3.1 KiB
C++
79 lines
3.1 KiB
C++
/*****************************************************************************
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*
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* Copyright (c) 2000 - 2007, The Regents of the University of California
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* Produced at the Lawrence Livermore National Laboratory
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* All rights reserved.
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*
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* This file is part of VisIt. For details, see http://www.llnl.gov/visit/. The
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* full copyright notice is contained in the file COPYRIGHT located at the root
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* of the VisIt distribution or at http://www.llnl.gov/visit/copyright.html.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* - Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the disclaimer below.
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* - Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the disclaimer (as noted below) in the
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* documentation and/or materials provided with the distribution.
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* - Neither the name of the UC/LLNL nor the names of its contributors may be
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* used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OF THE UNIVERSITY OF
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* CALIFORNIA, THE U.S. DEPARTMENT OF ENERGY OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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*****************************************************************************/
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#ifndef SIMPLEOBSERVER_H
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#define SIMPLEOBSERVER_H
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namespace pointsprite {
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class Subject;
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// *******************************************************************
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// Class: SimpleObserver
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//
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// Purpose:
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// Defines an interface for the observer in the observer design
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// pattern. See Design Patterns p.293
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//
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// Notes: This is an abstract base class. Note that the subject
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// that actually changed is passed to the Update method. This is so
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// we can support having observers that watch more than one subject.
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//
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// Programmer: Brad Whitlock
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// Creation: Thu Jun 1 11:28:42 PDT 2000
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//
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// Modifications:
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// Brad Whitlock, Thu Aug 31 15:18:18 PST 2000
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// Added SubjectRemoved.
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//
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// *******************************************************************
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class SimpleObserver
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{
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public:
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SimpleObserver();
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virtual ~SimpleObserver();
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virtual void Update(Subject *TheChangedSubject) = 0;
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virtual void SubjectRemoved(Subject *TheRemovedSubject);
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void SetUpdate(bool);
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bool GetUpdate();
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private:
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bool doUpdate;
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};
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}
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#endif
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